CN106968003A - Nd-Fe-B magnet steel overlay coating method - Google Patents
Nd-Fe-B magnet steel overlay coating method Download PDFInfo
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- CN106968003A CN106968003A CN201710123872.0A CN201710123872A CN106968003A CN 106968003 A CN106968003 A CN 106968003A CN 201710123872 A CN201710123872 A CN 201710123872A CN 106968003 A CN106968003 A CN 106968003A
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/10—Electroplating with more than one layer of the same or of different metals
- C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
- C25D5/14—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium two or more layers being of nickel or chromium, e.g. duplex or triplex layers
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/12—Electroplating: Baths therefor from solutions of nickel or cobalt
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/22—Electroplating: Baths therefor from solutions of zinc
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/38—Electroplating: Baths therefor from solutions of copper
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
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Abstract
The invention discloses a kind of Nd-Fe-B magnet steel overlay coating method, coating is carried out in neodymium-iron-boron steel surface, pre- zinc coat, the strong complex copper of plating or galvanized alloy layer, the neutral nickel dam of plating is followed successively by according to order from the inside to surface, plates without cyanogen alkali layers of copper and nickel coating；By zinc coat, as bottom, being added the strong complex copper of plating or galvanized alloy layer process so that Nd-Fe-B magnet steel coat binding strength is high, and antiseptic power is strong and magnetic loss is small；Adhesion is set averagely to improve 10~20% than common process by improving, average magnetic loss rate drops to 1~5% by the 5~10% of common process；The quality of magnet steel electroplating surface layer is greatly improved, the qualification rate of product is improved.
Description
Technical field
The invention belongs to Nd-Fe-B magnet steel Electroplating Technology for Surface field, more particularly to a kind of Nd-Fe-B magnet steel overlay coating
Method.
Background technology
In recent years, the development and application of rare-earth Nd-Fe-B (NdFeB) magnet steel are very rapid, and neodymium iron boron is because of its excellent magnetic
" king in magnetic " can be referred to as, be widely used in the fields such as communication, computer, military affairs, medical treatment.But it is due to Nd-Fe-B magnet steel
The presence of interior active neodymium, causes its corrosion resistance poor, and after Nd-Fe-B magnet steel corrodes, its magnetic property will decline, and then
Causing the reliability and stability of product reduces, and significantly limit the application of the magnet steel.Anticorrosive work to neodymium iron boron is proposed
Higher requirement.
Because plating have the advantages that protective capacities by force, process stabilizing, be easily achieved production in enormous quantities, most of neodymium iron boron materials
Material is used as anti-corrosion method from plating.Most neodymium-iron-boron steel dimensions are additionally, since smaller, so neodymium iron boron electroplating technology
Use barrel plating mostly.In order to improve the corrosion resistance of neodymium iron boron, neodymium iron boron electroplating technology typically uses electronickelling cupro-nickel (NiCuNi)
Technique, because the magnetic conduction and potential difference of prime coat are larger, will inevitably result in the magnetic loss of energy.
The content of the invention
For under the ambrose alloy nickel electroplating technical conditionses of existing Nd-Fe-B magnet steel, antiseptic power is poor, the magnetic loss of energy is big
Problem, the present invention provides a kind of bond strength height, the Nd-Fe-B magnet steel overlay coating method that antiseptic power is strong and magnetic loss is small.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
A kind of Nd-Fe-B magnet steel overlay coating method, coating is carried out in neodymium-iron-boron steel surface, suitable according to from the inside to surface
Sequence is followed successively by pre- zinc coat, the strong complex copper of plating or galvanized alloy layer, the neutral nickel dam of plating, plated without cyanogen alkali layers of copper and nickel coating.
Specifically include following steps：
(1) pre-treatment：The pre-treatment be by Nd-Fe-B magnet steel make oil removing, chamfering, pickling, ultrasonic wave cleaning, activation, it is pure
Washing；
(2) it is pre- zinc-plated：Nd-Fe-B magnet steel after above-mentioned pre-treatment is carried out in galvanizing bath it is pre- zinc-plated, it is cleaned again after plating
After be transferred in the strong complex copper of plating or kirsite groove；
(3) strong complex copper or galvanized alloy are plated：By it is above-mentioned it is pre- it is zinc-plated after Nd-Fe-B magnet steel enter in strong complex copper groove is plated
The strong complex copper of row plating, or galvanized alloy is carried out in kirsite groove, it is once purged again after plating to be transferred in plating neutral nickel groove；
(4) neutral nickel is plated：Nd-Fe-B magnet steel after the strong complex copper of above-mentioned plating or kirsite is carried out in plating neutral nickel groove
Neutral nickel is plated, it is once purged again after plating to be transferred to plating without in cyanogen alkali copper groove；
(5) plating is without cyanogen alkali copper：Nd-Fe-B magnet steel after above-mentioned plating neutral nickel is plated into no cyanogen in plating is without cyanogen alkali copper groove
Alkali copper, it is once purged again after plating to be transferred in nickel bath；
(6) nickel plating：Above-mentioned plating is subjected to nickel plating without the Nd-Fe-B magnet steel after cyanogen alkali copper in nickel bath；
(7) dried up after cleaning.
The pre- zinc-plated electroplate liquid, which is constituted, is：Zinc sulfate is 180~300 g/l, 20~35 g/l of boric acid, sodium sulphate 50
~160 g/l, 4~10 liters of BK-38 brighteners, pH 4~5,15~40 DEG C of operation temperature.
The strong complex copper is from traditional cyanide pre-plating copper or commercially available non-cyanide pre-plating copper；
The galvanized alloy selects various conventional admiroes, zinc-iron alloy, zinc-cobalt alloy, or Zinc-tin alloy；
The Zinc-nickel alloy electroplating liquid is constituted：30~65 g/l of nickel chloride, 40~60 g/l of zinc chloride, potassium chloride
220~320 g/l, 20~35 g/l of boric acid, the ml l of open cylinder agent 10~30, the ml l of complexing agent 30~80, pH value 5~
6。
The Zinc-nickel alloy electroplating liquid also can select conventional alkali plating solution.
The neutral nickel plating solution, which is constituted, is：100~150 g/l of nickel sulfate, 20~50 g/l of nickel chloride, complexing agent
100~200 g/l, pH value 6.8~7.3,40~50 DEG C of temperature.
Described to select citric acid copper facing without cyanogen alkali copper, citric acid plating solution for copper-plating used composition is：20~28 g/l of copper content,
300~380 g/l of potassium citrate, the ml l of CS open cylinder agents 50~80, the ml l of CS-1 brighteners 0.5~1, temperature 45~
50℃。
The nickel plating uses electronickelling or chemical nickel plating；
The nickel-plating bath is constituted：300~450 g/l of nickel sulfamic acid, 10~40 g/l of nickel chloride, boric acid 25
~45 g/l, the ml l of SN-B brighteners 2, pH value 3.6~4.8,50~60 DEG C of temperature.
The present invention has the advantages and positive effects of：
(1) present invention increases zinc coat on the basis of traditional nickel cupro-nickel, and using zinc coat as bottom, adds plating strong
Complex copper or galvanized alloy layer process, its flow is：Pre- zinc-plated → strong complex copper of plating or galvanized alloy → plating neutral nickel → copper facing
→ nickel plating, reduces bubble, loose, rust stain generation, it is to avoid because neodymium iron boron activity is big, cause the problem of coating comes off,
Coating adhesion is improved, porosity is reduced, the coating of densification is obtained, the quality of magnet steel electroplating surface layer is substantially increased, carries
The high qualification rate of product.
(2) preplating zinc is first carried out before plating, is reduced the potential difference between coating and base material, is existed while overcoming product
Open-assembly time is long in air, the problem of causing surface oxidation, influence product adhesion so that Nd-Fe-B magnet steel coat binding strength
Height, antiseptic power is strong and magnetic loss is small；By improving adhesion can be made averagely to improve 10~20% than common process,
(3) using the electroplated structural of multiple layer combination so that average high temperature magnetic loss rate drops to 1 by the 5~10% of common process
~5% so that Nd-Fe-B magnet steel has more wide application prospect.
Embodiment
In order to further understand the content, features and effects of the present invention, hereby enumerating following examples, and describe in detail
It is as follows：
A kind of Nd-Fe-B magnet steel overlay coating method, including the pre-treatment to Nd-Fe-B magnet steel, in neodymium-iron-boron steel surface
Carry out coating, be followed successively by pre- zinc coat according to order from the inside to surface, plate strong complex copper or galvanized alloy layer, the neutral nickel dam of plating,
Plating is without cyanogen alkali layers of copper and nickel coating.
The present invention is from plating Nd-Fe-B magnet steel size of sample 5.8*2.25*0.48, magnetic property 48SH.
Embodiment 1
(1) pre-treatment：It will be put into abrasive roller, add suitable together with corundum abrasive 8KG after blank black-film 1.5KG oil removings
Water is measured, chamfer grinding 2 hours, discharging sub-elects magnet steel, and with 2~4% dust technology pickling, 1~2 minute time, then ultrasonic wave are clear
After washing, it is put into the hydrofluoric acid of concentration 1% or so and activates 30 seconds, after rinsed clean, is fitted into plating barrel plating machine；
(2) it is pre- zinc-plated：Barrel plating machine is put into galvanizing bath, under 10 amperes of electric current, electroplates 80 minutes, plating is transferred to after cleaning
In admiro groove.
Pre- zinc-plated electroplate liquid, which is constituted, is：Zinc sulfate is 180 g/l, 20 g/l of boric acid, 50 g/l of sodium sulphate, BK-38 light
Bright dose 4 milliliters, pH 5,15 DEG C of operation temperature.
(3) zinc-nickel alloy：Electroplate, first electroplated 10 minutes under electric current 15A, then again by electric current in admiro groove
7.5A is dropped to electroplate 70 minutes, it is once purged again after plating to be transferred in plating neutral nickel groove；
Zinc-nickel alloy electroplating liquid is constituted：30 g/l of nickel chloride, 40 g/l of zinc chloride, 320 g/l of potassium chloride, boric acid
30 g/l, the ml l of open cylinder agent 10, the ml l of complexing agent 30, pH value 5.8.
(4) neutral nickel is plated：Electroplated in plating neutral nickel groove, first electroplate 5 minutes, then again drop electric current under electric current 15A
Electroplated 45 minutes to 5A, it is once purged again after plating to be transferred to plating without in cyanogen alkali copper groove.
Neutral nickel plating solution is constituted：100~150 g/l of nickel sulfate, 20~50 g/l of nickel chloride, complexing agent 100~
200 g/l, pH value 6.8~7.3,40~50 DEG C of temperature.
(5) plating is without cyanogen alkali copper：No cyanogen alkali copper is plated in plating is without cyanogen alkali copper groove, by citric acid plating solution for copper-plating used, in electricity
Flow and plated 160 minutes under 20A, it is once purged again after plating to be transferred in nickel bath；
Citric acid plating solution for copper-plating used is constituted：20 g/l of copper content, 300 g/l of potassium citrate, 50 milliliters of CS open cylinder agents/
Rise, the ml l of CS-1 brighteners 0.5, temperature 45 C.
(6) electronickelling：Electroplate, plated 160 minutes under electric current 20A, batch turning goes out drum in nickel bath, dried up after cleaning.
Nickel-plating bath is constituted：300~450 g/l of nickel sulfamic acid, 10~40 g/l of nickel chloride, boric acid 25~45
G/l, the ml l of SN-B brighteners 2, pH value 3.6~4.8,50~60 DEG C of temperature.
(7) test：Finished product is divided into 10 samples, 2 hours under conditions of temperature is 85 DEG C, humidity 85%, it entered
The test of row demagnetization rate, experimental result such as table 1 below.
Table 1 is the demagnetization rate after hot and humid after Nd-Fe-B magnet steel is electroplated
| Numbering | The magnetic flux of Nd-Fe-B magnet steel | The magnetic flux of Nd-Fe-B magnet steel after plating | Demagnetization rate (%) |
| 1 | 3.45 | 3.42 | 0.87% |
| 2 | 3.41 | 3.38 | 0.88% |
| 3 | 3.37 | 3.35 | 0.59% |
| 4 | 3.40 | 3.37 | 0.88% |
| 5 | 3.42 | 3.41 | 0.29% |
| 6 | 3.39 | 3.37 | 0.59% |
| 7 | 3.38 | 3.36 | 0.59% |
| 8 | 3.41 | 3.38 | 0.88% |
| 9 | 3.43 | 3.42 | 0.29% |
| 10 | 3.38 | 3.37 | 0.30% |
Experimental result such as table 1, the average value for being computed the magnetic flux of its Nd-Fe-B magnet steel is 3.40, is 85 in 2 hours temperature
DEG C, under conditions of humidity 85%, the average value 3.38 of the magnetic flux of the Nd-Fe-B permanent magnet after plating, demagnetization rate is 0.62%.
Experimental result show Nd-Fe-B magnet steel plating after after hot and humid magnetic loss≤5%.Significantly improve electrodeposited coating
The performance of quality and Nd-Fe-B magnet steel, so that Nd-Fe-B magnet steel has more wide application prospect.
Embodiment 2
(1) pre-treatment：It will be put into abrasive roller, add suitable together with corundum abrasive 8KG after blank black-film 1.5KG oil removings
Water is measured, chamfer grinding 2 hours, discharging sub-elects magnet steel, and with 2~4% dust technology pickling, 1~2 minute time, then ultrasonic wave are clear
After washing, it is put into the hydrofluoric acid of concentration 1% or so and activates 30 seconds, after rinsed clean, is fitted into plating barrel plating machine；
(2) it is pre- zinc-plated：Barrel plating machine is put into galvanizing bath, under 10 amperes of electric current, electroplates 80 minutes, plating is transferred to after cleaning
In admiro groove.
Pre- zinc-plated electroplate liquid, which is constituted, is：Zinc sulfate is 250 g/l, 28 g/l of boric acid, 110 g/l of sodium sulphate, BK-38
8 milliliters of brightener, pH 4.5,25 DEG C of operation temperature.
(3) zinc-nickel alloy：Electroplate, first electroplated 10 minutes under electric current 15A, then again by electric current in admiro groove
7.5A is dropped to electroplate 70 minutes, it is once purged again after plating to be transferred in plating neutral nickel groove；
Zinc-nickel alloy electroplating liquid is constituted：35 g/l of nickel chloride, 50 g/l of zinc chloride, 280 g/l of potassium chloride, boric acid
28 g/l, the ml l of open cylinder agent 20, the ml l of complexing agent 55, pH value 5.5.
(4) neutral nickel is plated：Electroplated in plating neutral nickel groove, first electroplate 5 minutes, then again drop electric current under electric current 15A
Electroplated 45 minutes to 5A, it is once purged again after plating to be transferred to plating without in cyanogen alkali copper groove.
Neutral nickel plating solution is constituted：100~150 g/l of nickel sulfate, 20~50 g/l of nickel chloride, complexing agent 100~
200 g/l, pH value 6.8~7.3,40~50 DEG C of temperature.
(5) plating is without cyanogen alkali copper：No cyanogen alkali copper is plated in plating is without cyanogen alkali copper groove, by citric acid plating solution for copper-plating used, in electricity
Flow and plated 160 minutes under 20A, it is once purged again after plating to be transferred in nickel bath；
Citric acid plating solution for copper-plating used is constituted：20 g/l of copper content, 300 g/l of potassium citrate, 50 milliliters of CS open cylinder agents/
Rise, the ml l of CS-1 brighteners 0.5, temperature 45 C.
(6) electronickelling：Electroplate, plated 160 minutes under electric current 20A, batch turning goes out drum in nickel bath, dried up after cleaning.
Nickel-plating bath is constituted：300~450 g/l of nickel sulfamic acid, 10~40 g/l of nickel chloride, boric acid 25~45
G/l, the ml l of SN-B brighteners 2, pH value 3.6~4.8,50~60 DEG C of temperature.
(7) test：Finished product is divided into 10 samples, 2 hours under conditions of temperature is 85 DEG C, humidity 85%, it entered
The test of row demagnetization rate, experimental result such as table 2 below.
Table 2 is the demagnetization rate after hot and humid after Nd-Fe-B magnet steel is electroplated
Experimental result such as table 2, the average value for being computed the magnetic flux of its Nd-Fe-B magnet steel is 3.40, is 85 in 2 hours temperature
DEG C, under conditions of humidity 85%, the average value 3.38 of the magnetic flux of the Nd-Fe-B permanent magnet after plating, demagnetization rate is 0.56%.
Experimental result show Nd-Fe-B magnet steel plating after after hot and humid magnetic loss≤5%.Significantly improve electrodeposited coating
The performance of quality and Nd-Fe-B magnet steel, so that Nd-Fe-B magnet steel has more wide application prospect.
Embodiment 3
(1) pre-treatment：It will be put into abrasive roller, add suitable together with corundum abrasive 8KG after blank black-film 1.5KG oil removings
Water is measured, chamfer grinding 2 hours, discharging sub-elects magnet steel, and with 2~4% dust technology pickling, 1~2 minute time, then ultrasonic wave are clear
After washing, it is put into the hydrofluoric acid of concentration 1% or so and activates 30 seconds, after rinsed clean, is fitted into plating barrel plating machine；
(2) it is pre- zinc-plated：Barrel plating machine is put into galvanizing bath, under 10 amperes of electric current, electroplates 80 minutes, plating is transferred to after cleaning
In admiro groove.
Pre- zinc-plated electroplate liquid, which is constituted, is：Zinc sulfate is 300 g/l, 35 g/l of boric acid, 160 g/l of sodium sulphate, BK-38
10 milliliters of brightener, pH 4,40 DEG C of operation temperature.
(3) zinc-nickel alloy：Electroplate, first electroplated 10 minutes under electric current 15A, then again by electric current in admiro groove
7.5A is dropped to electroplate 70 minutes, it is once purged again after plating to be transferred in plating neutral nickel groove；
Zinc-nickel alloy electroplating liquid is constituted：60 g/l of nickel chloride, 60 g/l of zinc chloride, 220 g/l of potassium chloride, boric acid
35 g/l, the ml l of open cylinder agent 30, the ml l of complexing agent 80, pH value 5.6.
(4) neutral nickel is plated：Electroplated in plating neutral nickel groove, first electroplate 5 minutes, then again drop electric current under electric current 15A
Electroplated 45 minutes to 5A, it is once purged again after plating to be transferred to plating without in cyanogen alkali copper groove.
Neutral nickel plating solution is constituted：100~150 g/l of nickel sulfate, 20~50 g/l of nickel chloride, complexing agent 100~
200 g/l, pH value 6.8~7.3,40~50 DEG C of temperature.
(5) plating is without cyanogen alkali copper：No cyanogen alkali copper is plated in plating is without cyanogen alkali copper groove, by citric acid plating solution for copper-plating used, in electricity
Flow and plated 160 minutes under 20A, it is once purged again after plating to be transferred in nickel bath；
Citric acid plating solution for copper-plating used is constituted：20 g/l of copper content, 300 g/l of potassium citrate, 50 milliliters of CS open cylinder agents/
Rise, the ml l of CS-1 brighteners 0.5, temperature 45 C.
(6) electronickelling：Electroplate, plated 160 minutes under electric current 20A, batch turning goes out drum in nickel bath, dried up after cleaning.
Nickel-plating bath is constituted：300~450 g/l of nickel sulfamic acid, 10~40 g/l of nickel chloride, boric acid 25~45
G/l, the ml l of SN-B brighteners 2, pH value 3.6~4.8,50~60 DEG C of temperature.
(7) test：Finished product is divided into 10 samples, 2 hours under conditions of temperature is 85 DEG C, humidity 85%, it entered
The test of row demagnetization rate, experimental result such as table 3 below.
Table 3 is the demagnetization rate after hot and humid after Nd-Fe-B magnet steel is electroplated
| Numbering | The magnetic flux of Nd-Fe-B magnet steel | The magnetic flux of Nd-Fe-B magnet steel after plating | Demagnetization rate (%) |
| 1 | 3.36 | 3.33 | 0.89% |
| 2 | 3.45 | 3.41 | 1.16% |
| 3 | 3.42 | 3.40 | 0.58% |
| 4 | 3.39 | 3.37 | 0.59% |
| 5 | 3.41 | 3.40 | 0.29% |
| 6 | 3.38 | 3.36 | 0.59% |
| 7 | 3.40 | 3.39 | 0.29% |
| 8 | 3.38 | 3.37 | 0.30% |
| 9 | 3.40 | 3.37 | 0.88% |
| 10 | 3.41 | 3.39 | 0.59% |
Experimental result such as table 3, the average value for being computed the magnetic flux of its Nd-Fe-B magnet steel is 3.40, is 85 in 2 hours temperature
DEG C, under conditions of humidity 85%, the average value 3.379 of the magnetic flux of the Nd-Fe-B permanent magnet after plating, demagnetization rate is 0.616%.
Experimental result show Nd-Fe-B magnet steel plating after after hot and humid magnetic loss≤5%.Significantly improve electrodeposited coating
The performance of quality and Nd-Fe-B magnet steel, so that Nd-Fe-B magnet steel has more wide application prospect.
Embodiment 4
(1) pre-treatment：It will be put into abrasive roller, add suitable together with corundum abrasive 8KG after blank black-film 1.5KG oil removings
Water is measured, chamfer grinding 2 hours, discharging sub-elects magnet steel, and with 2~4% dust technology pickling, 1~2 minute time, then ultrasonic wave are clear
After washing, it is put into the hydrofluoric acid of concentration 1% or so and activates 30 seconds, after rinsed clean, is fitted into plating barrel plating machine；
(2) it is pre- zinc-plated：Barrel plating machine is put into galvanizing bath, under 10 amperes of electric current, electroplates 80 minutes, plating is transferred to after cleaning
In admiro groove.
Pre- zinc-plated electroplate liquid, which is constituted, is：Zinc sulfate is 260 g/l, 28 g/l of boric acid, 110 g/l of sodium sulphate, BK-38
8 milliliters of brightener, pH 4.5,30 DEG C of operation temperature.
(3) strong complex copper is plated：Electroplate, first electroplated 10 minutes under electric current 10A, then again by electric current in strong complex copper groove
5A is dropped to electroplate 70 minutes, it is once purged again after plating to be transferred in plating neutral nickel groove；
Strong complex copper is from traditional cyanide pre-plating copper
(4) neutral nickel is plated：Electroplated in plating neutral nickel groove, first electroplate 5 minutes, then again drop electric current under electric current 15A
Electroplated 45 minutes to 5A, it is once purged again after plating to be transferred to plating without in cyanogen alkali copper groove.
Neutral nickel plating solution is constituted：100~150 g/l of nickel sulfate, 20~50 g/l of nickel chloride, complexing agent 100~
200 g/l, pH value 6.8~7.3,40~50 DEG C of temperature.
(5) plating is without cyanogen alkali copper：No cyanogen alkali copper is plated in plating is without cyanogen alkali copper groove, by citric acid plating solution for copper-plating used, in electricity
Flow and plated 160 minutes under 20A, it is once purged again after plating to be transferred in nickel bath；
Citric acid plating solution for copper-plating used is constituted：20 g/l of copper content, 300 g/l of potassium citrate, 50 milliliters of CS open cylinder agents/
Rise, the ml l of CS-1 brighteners 0.5, temperature 45 C.
(6) electronickelling：Electroplate, plated 160 minutes under electric current 20A, batch turning goes out drum in nickel bath, dried up after cleaning.
Nickel-plating bath is constituted：300~450 g/l of nickel sulfamic acid, 10~40 g/l of nickel chloride, boric acid 25~45
G/l, the ml l of SN-B brighteners 2, pH value 3.6~4.8,50~60 DEG C of temperature.
(7) test：Finished product is divided into 10 samples, 2 hours under conditions of temperature is 85 DEG C, humidity 85%, it entered
The test of row demagnetization rate, experimental result such as table 4 below.
Table 4 is the demagnetization rate after hot and humid after Nd-Fe-B magnet steel is electroplated
Experimental result such as table 2, the average value for being computed the magnetic flux of its Nd-Fe-B magnet steel is 3.40, is 85 in 2 hours temperature
DEG C, under conditions of humidity 85%, the average value 3.38 of the magnetic flux of the Nd-Fe-B permanent magnet after plating, demagnetization rate is 0.587%.
Experimental result show Nd-Fe-B magnet steel plating after after hot and humid magnetic loss≤5%.Significantly improve electrodeposited coating
The performance of quality and Nd-Fe-B magnet steel, so that Nd-Fe-B magnet steel has more wide application prospect.
Although the preferred embodiments of the present invention are described above, the invention is not limited in above-mentioned specific
Embodiment, above-mentioned embodiment is only schematical, is not restricted, one of ordinary skill in the art
Under the enlightenment of the present invention, in the case of present inventive concept and scope of the claimed protection is not departed from, it can also make very
Multi-form, these are belonged within protection scope of the present invention.
Claims (9)
1. a kind of Nd-Fe-B magnet steel overlay coating method, it is characterised in that carry out coating in neodymium-iron-boron steel surface, according to from inner
Pre- zinc coat, the strong complex copper of plating or galvanized alloy layer, the neutral nickel dam of plating are followed successively by outer order, plated without cyanogen alkali layers of copper and nickel plating
Layer.
2. Nd-Fe-B magnet steel overlay coating method according to claim 1, it is characterised in that the pre- zinc-plated electroplate liquid group
Turn into：Zinc sulfate is 180~300 g/l, 20~35 g/l of boric acid, 50~160 g/l of sodium sulphate, BK-38 brighteners 4~
10 milliliters, pH 4~5,15~40 DEG C of operation temperature.
3. Nd-Fe-B magnet steel overlay coating method according to claim 1, it is characterised in that the strong complex copper is from biography
System cyanide pre-plating copper or commercially available non-cyanide pre-plating copper.
4. Nd-Fe-B magnet steel overlay coating method according to claim 1, it is characterised in that the galvanized alloy selects zinc
Nickel alloy, zinc-iron alloy, zinc-cobalt alloy, or Zinc-tin alloy.
5. Nd-Fe-B magnet steel overlay coating method according to claim 4, it is characterised in that the Zinc-nickel alloy electroplating liquid
Constitute and be：30~65 g/l of nickel chloride, 40~60 g/l of zinc chloride, 220~320 g/l of potassium chloride, 20~35 grams of boric acid/
Rise, the ml l of open cylinder agent 10~30, the ml l of complexing agent 30~80, pH value 5~6.
6. Nd-Fe-B magnet steel overlay coating method according to claim 1, it is characterised in that the neutral nickel plating solution group
Turn into：100~150 g/l of nickel sulfate, 20~50 g/l of nickel chloride, 100~200 g/l of complexing agent, pH value 6.8~7.3,
40~50 DEG C of temperature.
7. Nd-Fe-B magnet steel overlay coating method according to claim 1, it is characterised in that described to select lemon without cyanogen alkali copper
Lemon acid copper facing, citric acid plating solution for copper-plating used, which is constituted, is：20~28 g/l of copper content, 300~380 g/l of potassium citrate, CS is opened
The ml l of cylinder agent 50~80, the ml l of CS-1 brighteners 0.5~1,45~50 DEG C of temperature.
8. Nd-Fe-B magnet steel overlay coating method according to claim 1, it is characterised in that the nickel plating uses electronickelling
Or chemical nickel plating.
9. Nd-Fe-B magnet steel overlay coating method according to claim 1, it is characterised in that the nickel-plating bath composition
For：300~450 g/l of nickel sulfamic acid, 10~40 g/l of nickel chloride, 25~45 g/l of boric acid, 2 milliliters of SN-B brighteners/
Rise, pH value 3.6~4.8,50~60 DEG C of temperature.
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| CN109208048A (en) * | 2018-08-08 | 2019-01-15 | 北京麦戈龙科技有限公司 | Coating structure of Sintered NdFeB magnet and preparation method thereof |
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| CN110983392A (en) * | 2019-12-31 | 2020-04-10 | 包头天和磁材科技股份有限公司 | Method for electroplating zinc-nickel alloy, magnet, electroplating solution and use of potassium chloride |
| CN110983392B (en) * | 2019-12-31 | 2021-05-28 | 包头天和磁材科技股份有限公司 | Method for electroplating zinc-nickel alloy, magnet, electroplating solution and use of potassium chloride |
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